Abstract

We have designed and fabricated one dimensional photonic bandgap(PBG) structures from dielectricmultilayers of porous silicon, with a periodic repetition of a unit cell consisting of 21 layers (95%) with the refractive index varying according to the envelope of a Gaussian function and another layer (5%) with a fixed refractive index. The structures can be designed to demonstrate the wavelength scalability within the visible as well as near infrared region. Three different structures have been stacked together to enhance the width of the PBG. The omnidirectional nature of the PBG was verified experimentally and theoretically up to and angles of incidence, respectively.

Received 25 August 2008Accepted 28 October 2008Published online 14 November 2008

Acknowledgments:

We gratefully acknowledge technical help provided by Daniel R. Menesez of IPICyT, San Luis Potosi and useful discussions made with J. E. Garcia. This work has been partially supported by CONACyT under project 57631 (V.A.) and by PROMEP Grant No. BUAP-PTC-133 (A.M.B.).